Wolf CT Electric Cooktop Code E66: L2 failure, shorted triac or K10

What E66 means

On Wolf CT electric cooktops (CTE and CTE-2), including the CT30E/S and CT36E/S, E66 is an L2 associated failure. The listed causes are a shorted triac, or relay K10 on 36-inch units. Put simply, a switching part on the second power leg has failed. The display shows E66, and an element may heat when it should not or may not heat at all.

Common causes of E66

Shorted triac on the L2 leg
Relay K10 on 36-inch cooktops
Power module needing replacement

✓ One safe check you can try

1. If any element stays on with the controls off, switch off the breaker right away. 2. If not, let the surface cool and reset the breaker for one minute. 3. If E66 returns, keep the cooktop unused and call us. Please do not open the unit.

! Why to stop there

A shorted switching part can leave power flowing, so we handle E66 carefully.
The right fix depends on whether your cooktop is the 30-inch or 36-inch size.
Expect a written price before work.
Our visit carries a 30-day workmanship warranty, confirmed in writing.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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E66E66 questions

What is a triac?

A triac is an electronic switch that controls power to an element. If it shorts, it can let current through when the control wants it off, and the board reports E66.

Why does 36-inch matter?

Larger 36-inch cooktops have a relay named K10 that the 30-inch sizes lack, so the list of possible causes is a little longer for the 36-inch size.

Is E66 urgent?

If anything stays hot when it should be off, yes, use the breaker and call us. If everything shuts off normally, still book a visit soon.